W4 6254 then U2 1684 at Fiumicino
Palermo → Rome → Nice
Timetable, Rome time
17:20W4 6254 from Palermo at the gate
14:45U2 1684 to Nice leaves the gate
21 h 25 apart on the timetable, overnight
U2 1684 leaves 21 h 25 after W4 6254 arrives on the timetable: more than half a day, so not a connection we count.